Yeah, I think some of the really low ones are more likely erroneous readings from the watch, though a few times I have manually checked (full minute) and it's been accurate. But I'm generally just recording the rhr as determined by watch which is on all day except when showering. On the charger at night..

And I usually update my log in the AM, then again in the evening, but some days I neglect the later reading, so the high readings are probably days I record the AM after moving around a bit, my lowest readings are usually mid afternoon, particularly if I'm sitting back and reading by fire. It's 40 right now..